a swelling (= an area that is larger and rounder than normal) on the surface of the skin that is filled with liquid and is caused, for example, by rubbing or burning （皮肤上摩擦或烫等引起的）水疱，疱 These shoes have given me blisters on my heels. 这双鞋让我的脚后跟起了水泡。 He’d got blisters on his feet from running. 他的脚因为跑步起了水疱。 There was a blister on her cheek where the boiling milk had splashed her. 沸腾的牛奶溅到她的地方，她的脸颊上起了一个水泡。
a similar swelling, filled with air or liquid, on metal, painted wood or another surface （金属、油漆过的木头或其他表面上的）泡，气泡，水泡
Word OriginMiddle English: perhaps from Old French blestre ‘swelling, pimple’.